We implemented uvc+uart project using our own sensor on CX3. It works fine on high speed, but we have a problem with suspend mode on super speed. The sensor get the power form usb and we don't want to shut it down on suspend request. Is there a way to disable or ignore suspend request from the host on super speed?

You cannot ignore the Suspend request from USB host as per the USB specification. However, if you are not looking for USB compliance certification, you can avoid calling the EnterSuspendMode() API. This will keep your core in active state.